Microcontrollers have become very useful in embedded design as they can easily communicate with other devices, such as sensors, switches, LCD displays, keypads, motors and even other microcontrollers. A microcontroller is basically used as the brain or intelligent processing unit to control other devices connected (interfaced) to it in embedded systems just like a PLC in industrial automation. To interface a device to a microcontroller simply means to Connect a device to a microcontroller. This article will make it easier to anybody with very limited experience in electronics to learn how to interface to a PIC Microcontroller some advanced components Graphical LCD, Quad 7-Segment Display, SD Card, DC Motor, GSM modem, GPS module, Real Time Clock and so on.